Re: [ECOS] Problems with RedBoot on x86 generic pc...

[Adam Agnew <agnew@missl.cs.umd.edu>]

I finally found time to try that, and yes it worked on machines where it
wasn't working when there were two serial ports specified. Thanks, and I
hope this info is helpfull in tracking the bug down.
- adam agnewx

On Thu, 13 Sep 2001, Jonathan Larmour wrote:

> Adam Agnew wrote:
> >
> > I've tried the provided image for a floppy on several x86 boxen, and it
> > works on some, doesn't on others. As a test, i tried setting
> >
> > cdl_option CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS { user_value 1 };
> > and
> > cdl_option CYGSEM_HAL_I386_PC_DIAG_SCREEN { user_value 0 };
> >
> > That certainly cleared up the problem, but of course gets rid of the PC's
> > screen, which was nice. Maybe someone can use this info to track down the
> > bug, I'm not that familiar with the code base yet. But that's a temporary
> > fix for poor folks like me who it wasn't working for. Perhaps this is
> > just a problem with motherboards with only one serial port. Perhaps its
> > deeper, *shrug*.
>
> One way to find out if there's a problem with boards with one serial
> port.... go to hal/i386/pcmb/current/src/pcmb_serial.c and comment out the
> stuff for channel 1 in cyg_hal_plf_serial_init.
>
> Then go to pcmb_screen.c and in cyg_hal_plf_screen_init change all the "2"s
> to "1"s.
>
> Go to /hal_diag.c and remove the middle entry of pc_ser_channels and change
> the 3 to a 2.
>
> Finally go to hal/i386/pc/current/cdl_hal_i386_pc.cdl and change
> CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS to have:
>
>        default_value   { CYGSEM_HAL_I386_PC_DIAG_SCREEN ? 2 : 1 }
>
> Then build and try a redboot on a PC with one serial port. If it works
> where the old image didn't, let us know.
>
> Jifl
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